Increasing uncertainties of fossil fuel attenuation and tough emission protocols compel the research community to explore alternative fuels for diesel engines. Hydrogen (H₂) is one of the best alternatives for conventional fuel because it is carbonfree. H₂ has benefits and a few limitations in its use as a fuel in an automotive engine. However, H₂ improves the engine performance, with a minor price in NO_X formation. One method to trim down NO_X without conceding engine performance is the addition of exhaust gas recirculation (EGR). Till date, hardly any literature discussed the mixing characteristic of H₂ with air in the intake manifold of an engine in the presence of exhaust gas at an elevated temperature. The present research studies the performance and mixing characteristics of H₂ and air in the engine manifold without and with the addition of 5% EGR. The study used the computational fluid dynamics (CFD) tool ANSYS Fluent 2020. The boundary conditions for the simulation are acquired from the experiments performed in a Twin-Cylinder Common Rail Direct Injection (CRDi) diesel engine. The simulations are performed in an F-shape manifold fitted in the engine as per the actual dimension measured. The obtained results show that the pressure variation is not so significant when it comes to plain diesel and Diesel+5%EGR. With the increase in load, the values of velocity increase. At higher loads in a dual-fuel engine, the turbulent intensity had a higher value than the lower ones. The mass fraction of H₂ is higher at the injector outlets.